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https://bugzilla.redhat.com/show_bug.cgi?id=238813
Harshula Jayasuriya <harshula(a)redhat.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |harshula(a)redhat.com
--- Comment #4 from Harshula Jayasuriya <harshula(a)redhat.com> 2009-04-14 04:09:51
EDT ---
Hi,
Looks like this has been fixed in TOT:
-------------------------------------------------
commit eccb95cee4f0d56faa46ef22fb94dd4a3578d3eb
Author: Jan Kara <jack(a)suse.cz>
Date: Tue Apr 29 00:59:37 2008 -0700
vfs: fix lock inversion in drop_pagecache_sb()
Fix longstanding lock inversion in drop_pagecache_sb by dropping inode_lock
before calling __invalidate_mapping_pages(). We just have to make sure
inode
won't go away from under us by keeping reference to it and putting the
reference only after we have safely resumed the scan of the inode list. A
bit
tricky but not too bad...
Signed-off-by: Jan Kara <jack(a)suse.cz>
Cc: Fengguang Wu <wfg(a)mail.ustc.edu.cn>
Cc: David Chinner <dgc(a)sgi.com>
Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds(a)linux-foundation.org>
diff --git a/fs/drop_caches.c b/fs/drop_caches.c
index e2c6b65..50f9087 100644
--- a/fs/drop_caches.c
+++ b/fs/drop_caches.c
@@ -14,15 +14,21 @@ int sysctl_drop_caches;
static void drop_pagecache_sb(struct super_block *sb)
{
- struct inode *inode;
+ struct inode *inode, *toput_inode = NULL;
spin_lock(&inode_lock);
list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
if (inode->i_state & (I_FREEING|I_WILL_FREE))
continue;
+ __iget(inode);
+ spin_unlock(&inode_lock);
__invalidate_mapping_pages(inode->i_mapping, 0, -1, true);
+ iput(toput_inode);
+ toput_inode = inode;
+ spin_lock(&inode_lock);
}
spin_unlock(&inode_lock);
+ iput(toput_inode);
}
static void drop_pagecache(void)
-------------------------------------------------
Regards,
Harshula
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